Deck 4: C: Numerical Descriptive Techniques

Question 1

The coefficient of correlation and the least squares line both describe the relationship between two interval variables.

Answer 1

True

Question 2

Statisticians typically apply graphical techniques as a first step in a data analysis because we first need to know the shape of the distribution.

Answer 2

True

Question 3

A scatter diagram reveals a strong positive linear relationship between oil and gasoline prices.Which of the following numerical techniques will not give us more detailed information about this relationship?

A) Coefficient of determination
B) Coefficient of correlation
C) Coefficient of variation.
D) All of these choices help us describe this relationship.

Answer 3

C

Question 4

Which of the following characteristics does a histogram help you identify?

A) The shape of distribution.
B) The approximate center of a distribution.
C) The amount of spread in a distribution.
D) All of these choices are true.

Question 5

Statisticians usually apply graphical techniques as a first step in analyzing data because we first need to know the ____________________ of the distribution.

Question 6

What statistics and graphs can you use to look for a relationship between two interval variables?

Question 7

What statistics and graphs can you use to answer the following question: Are the observations close to one another,or are they widely dispersed?

Question 8

The precision provided by the numerical techniques (mean,median,and standard deviation)provides more useful information than graphical techniques (histograms and box plots)alone.

Question 9

Box plots and medians work well to describe ____________________ data,while histograms and means work well to describe ____________________ data.

Question 10

What statistics and graphs can you use to answer the following questions: Is the distribution unimodal,bimodal,or multimodal? If there is more than one mode,where are the peaks,and where are the valleys?

Question 11

The shape of a distribution helps answer which question about the data?

A) Where is the approximate center of the distribution?
B) Are the observations close to one another,or are they widely dispersed?
C) Is the distribution symmetric?
D) All of these choices are true.

Question 12

What statistics and graphs can you use to answer the following question: Where is the approximate center of the distribution?

Question 13

Which of the following is correct about the shape of a distribution?

A) The shape can show you how many modes there are.
B) The shape can help you determine the approximate center of the distribution.
C) The shape can help you determine whether the data are close or spread out.
D) All of these choices are true.

Question 14

____________________ techniques give you the big picture of a distribution and ____________________ techniques give you more precise details.

Question 15

Graphical and numerical techniques,such as histograms and least squares lines provide identical information.

Question 16

We can frequently make several inferences about the nature of the data from the ____________________ of its histogram.

Question 17

What statistics and graphs can you use to answer the following question: Is the distribution symmetric? If not,is it skewed? If symmetric,is it bell shaped?

Question 18

Scatter diagrams,covariance,and the coefficient of correlation are useful techniques for detecting relationships between two ____________________ variables.